The hearth and the Salamander can also mean happiness and if Montag chose to be happy or not. The two things in his life his home and his work. Did it really make him happy. He chose happiness over this home and his work by reading the books.
It is in all of us to defy expectations - to go into the world and to be brave and to want, to need, to hunger for adventures to embrace change and chance and risk so that we may breathe and know what it is to be free..